Vaporcompression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. Fundamentals of mechanical refrigeration systems course content introduction mechanical refrigeration is a thermodynamic process of removing heat from a lower temperature heat source or substance and transferring it to a higher temperature heat sink. Performance evaluation of vapour compression refrigeration. The cop of vapor compression refrigeration system can be improved either. Pdf exergy analysis of vapour compression refrigeration system. Layout of the r22 vapourcompression refrigeration system. The refrigeration capacity is 8 tr and the compression is adiabatic reversible process. The evaporator and condenser are fabricated as shell and tube type adiabatic. Refrigeration may be defined as a process of removing heat from a substance and pumping it to the surroundings. The vcr has a small ice cabin whereas the var system has only an evaporator plate and behind it, the cooling coil is attached. Jun 01, 2017 learn how to solve problem of refrigeration.
It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. Cycle with dry saturated vapour after compression 2. Note that there are different vapour compression cycles. Must ensure the prevention of leakage of refrigerant. Performance analysis of vapour compression and vapour. The vapor compression refrigeration cycle is a common method for transferring heat. The refrigeration capacity is 8 tr and the compression is. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. This is the most important system for commercial and domestic utility. The cop of a refrigeration system also increases as a result of cascading. The operating principle of the refrigeration cycle was described. The basic components of any refrigeration system working on the vapour compression cycle, are the compressor, condenser, expansion valve, evaporator and the refrigerant fluid which is alternatively vapourized and liquefied during the refrigeration cycle.
The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. Secondlaw analysis of twostage vapour compression 643 the terms exergyc and exergy analysis were created by rant 1963 and its use has been increasing significantly since due to the growing present need to improve the process efficiency in power systems. Design of two stage vapour compression refrigeration. Typical vapor compression systems can be represented as shown in figure. It is generally used for all industrial purposes from a small domestic refrigerator to a big airconditioning plant. Both a steadystate and a transient simulation will be considered.
This course is an overview of vaporcompression refrigeration cycle, principles of heat generation, transfer and rejection. Today we will study the difference between vapour compression and vapour absorption refrigeration system in detail. Joshi 1 department of mechanical engineering, walchand college of engineering, sangli 416415, maharashtra, india abstract refrigeration is the process of reducing and maintaining the temperature of a space or material below the. Vapour compression refrigeration is the primary method to provide mechanical cooling.
Refrigeration cycle is the basis of all refrigeration systems. The saturated vapour refrigerator again routed back to the compressor. Design of two stage vapour compression refrigeration system. Learn how to solve problem of vapour compression refrigeration system. Ppt vapour compression cycle powerpoint presentation. One of the most important parts of any refrigeration cycle is the compression of the refrigerant since all the further operations depend on it. Hrnjak, in 8th international conference on compressors and their systems, 20. Ppt vapour compression cycle powerpoint presentation free. Liquefaction of gases another way of improving the performance of a vaporcompression refrigeration system is by using multistage compression with regenerative cooling. This paper gives the overview of important modifications in vcrs were gifted to society. Irreversibility within the evaporator, condenser and compressor are ignored no frictional pressure drops refrigerant flows at constant pressure through the two heat exchangers evaporator and condenser heat losses to the surroundings are ignored compression process is. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many.
An exergy analysis or 2nd law analysis is a very powerful way of optimizing complex thermodynamic systems. This vapour compression system mainly consists of a refrigerator compressor, a liquid compressor. Methods for improving thermodynamic performances of. Mechanism and working of a vapour compression refrigeration.
This is the part of the refrigeration system that is doing the actual cooling. Pdf in vapour compression refrigeration system, it generates fresh drinking water and also extracts water from humid ambient air by using. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. The evaporating temperature is 25 oc and condensing temperature 47 oc. Mar 09, 2016 comparison of vapor absorption system with vapor compression system can be done in 9 aspects, they are energy input, moving part, evaporator pressure, load variation, evaporator exit, coefficient of performance, capacity, refrigerant and lowest temperatures. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. In this study, a very simplified dynamic lumped model for the simulation of smallscale singletemperature vapor compression refrigerators working between two thermal sources with finite thermal. Vapour compression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. In this type of refrigerator, refrigerant undergoes phase changes. Powerconsuming systems, such as vapour compression refrigeration and vacuum distillation plant. This type of methodology entails applying the first. A free powerpoint ppt presentation displayed as a flash slide show on id.
This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Jun 02, 2017 learn how to solve problem of vapour compression refrigeration system. Oil in circulation in an vapor compression refrigeration system is known to cause a reduction in heat transfer coefficient and increase in pressure drop in heat exchangers and connecting lines 1,2,3, as well as reducing the oil level inside the compressor crankcase. The vapour compression refrigeration and vapour absorption refrigeration systems were developed around 1870. The above figure shows simple vapour compression refrigeration system. In this articles we discussed about difference between vapour compression and vapour absorption refrigeration system and pdf is available generic selectors. Vapour compression refrigera tion system, refrigerant, ozone depletion, global warming, cfc.
Design and construction of a vapour compression refrigeration system as test rig to investigate the performance of liquefied petroleum. Vapour compression problem with superheating and subcooling mechiteasy. Vapor compression refrigeration system basic, working, parts of. Mechanism and working of a vapour compression refrigeration system with pv and ts diagram.
Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. Here harshit solves some sample questions which will help one to recollect and remember all the topics and equations which were discussed in the previous lesson. Fundamentals of mechanical refrigeration systems course content. In this system, the working substance is a refrigerant like nh 3, r11, r12. Chapter 1011 multipurpose refrigeration systems a refrigerator with a single compressor can provide refrigeration at several temperatures by throttling the. In refrigeration system condenser is used in high pressure side.
Pdf vapour compression refrigeration system generating fresh. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. Vapour compression cycle energy management handbook sixth edition, chapter 8 refrigerator air conditioning plant heat pump refrigerator electricmotordriven. Refrigerants for vapour compression refrigeration systems.
Methods for improving thermodynamic performances of vapor. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. Refrigeration system performance using liquidsuction heat. R152a performed better than r4a in terms of cop, exergetic efficiency and efficiency defect as r12 substitute in domestic refrigeration system. Dec 31, 2016 vapour compression refrigeration system 1. The vapour compression refrigeration system is by far the most popular and widely used system in refrigeration and air conditioning bot for industrial and domestic applications. Layout of the r22 vapour compression refrigeration system. It is also used in domestic and commercial refrigerators, largescale warehouses for. According to him a miniature vapour compression refrigerator could be a. Its major function is to remove heat of hot vapour refrigerant which is discharged from the. Refrigeration and air conditioning multiple choice questions.
The main differences between vapour compression and vapour absorption refrigeration system are vapor compression has high c. Refrigeration onboard ships marine engineering study. Exergy analysis of vapour compression refrigeration system. Powerproducing systems, such as those based on the rankine cycle. Compressor, concentration, performance, temperature introduction the most commonly used method of cooling is with vapor compression cycles, because it. Vapor compression refrigeration system basic, working. Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1. Chapter 1010 multistage compression refrigeration systems. In the vapor compression refrigeration system the compr. Vapor compression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. Brownell college of engineering university of wisconsin madison abstract heat transfer devices are provided in many refrigeration systems to exchange energy between the. Vapour compression problem with superheating and subcooling. Feb 10, 2017 mechanism of simple vcrs assumptions for ideal vapor compression cycle are.
Domestic refrigerator working on vapour compression cycle uses the following type of expansion device a. The vapor compression refrigeration cycle, step by step. These are the evaporator, condenser, compressor and the expansion valve. Compressor, concentration, performance, temperature introduction the most commonly used method of cooling is with vaporcompression cycles, because it. In this articles we discussed about difference between vapour compression and vapour absorption refrigeration system and pdf is available. Vapor compression refrigeration an overview sciencedirect. P coefficient of performance and vapour absorption has low c. At the bottom of the articles you can download pdf.
Pdf a compact dynamic model for household vapor compression. Refrigeration systems are also rated in terms of tons of refrigeration. System description the layout of the system is shown in figure 1. Mechanism of simple vcrs assumptions for ideal vaporcompression cycle are.
Because its function is to absorb heat into the refrigeration system from where you dont want it, the evaporator is placed in the area to be cooled. A textbook of refrigeration and air conditioning simple vapour. Multipurpose refrigeration systems a refrigerator with a single compressor can provide refrigeration at several temperatures by throttling the refrigerant in stages. Exergy analysis of vapour compression refrigeration system article pdf available in international journal of applied engineering research 412. Pdf design and construction of a vapour compression. Performance characteristics of vapour compression refrigeration system under real transient conditions j. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a microscale refrigerator. Refrigerant r22 vapour enters a positive displacement compressor at a slightly. Difference between vapour compression and vapour absorption pdf. Comparison of vapor absorption system with vapor compression. Difference between vapour compression and vapour absorption. Initially the system was singlestage with a single compressor compressing the refrigerant vapour from evaporator to.
Exery analysis of vapour compression refrigeration system 2521 2 this can be explained b y the fact that total exergy losses decreas e with increase in degree of sub cooling. Initially the system was singlestage with a single compressor compressing the refrigerant vapour from evaporator to a condenser operating at 1500 kpa pressure. Comparison of vapor absorption system with vapor compression system can be done in 9 aspects, they are energy input, moving part, evaporator pressure, load variation, evaporator exit, coefficient of performance, capacity, refrigerant and lowest temperatures. In order to illustrate the systems benefit that can be achieved, it is helpful to classify the main types of equipment using twophase heat exchangers as follows. Mechanism and working of a vapour compression refrigeration system comparison between heat engine, refrigerator, and heat pump disadvantages. Design of two stage vapour compression refrigeration system with water intercooler 1pravin d. Vapour compression refrigeration or vapor compression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles.
Refrigeration system performance using liquidsuction heat exchangers s. All vapor compression systems consist of the following four basic components alongwith the interconnecting piping. Experimental setup and procedures the experimental set up of a simple vapour compression refrigeration system used in study is shown in fig. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats.
It also includes the process of maintaining and reducing the temperature of a body below the general temperature of its surroundings. Vapour compression refrigeration system slideshare. A textbook of refrigeration and air conditioning by r. Refrigeration onboard ships marine engineering study materials. List of 2 main refrigeration systems electrical engineering. Components of vapour compression refrigeration cycle compressor the low pressure saturated vapour refrigerant from evaporator drawn into the compressor through suction valve. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration.
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